Around 2001, AD wiseguys, our gun club got an incredible deal for the Estate 12 ga. target loads (SS12H 9). The club bought several pallets of them and I took 20 cases. That’s 5,000 rounds without a so much as a misfire, ftf, ftf, or fte. This ammo was costing me $0.25 a box less than reloading. 20/20 hindsight: I wish that I bought a whole lot more!
Note: I used it for skeet competition and it was fine. Target distances are short in skeet and shot deformation is for the most part a negligible factor. When I competed in major competitions I did use premium ammo because I wanted all the odds in my favor... a mental thing mostly.